-------------------------------------------------
-- mpd Arc Widget for Awesome Window Manager
-- Modelled after Pavel Makhov's work

-- @author Raphaël Fournier-S'niehotta
-- @copyright 2018 Raphaël Fournier-S'niehotta
-------------------------------------------------

local awful = require("awful")
local beautiful = require("beautiful")
local spawn = require("awful.spawn")
local watch = require("awful.widget.watch")
local wibox = require("wibox")
local naughty = require("naughty")

local GET_MPD_CMD = "mpc status"
local TOGGLE_MPD_CMD = "mpc toggle"
local PAUSE_MPD_CMD = "mpc pause"
local STOP_MPD_CMD = "mpc stop"
local NEXT_MPD_CMD = "mpc next"
local PREV_MPD_CMD = "mpc prev"

local PATH_TO_ICONS = "/usr/share/icons/Arc"
local PAUSE_ICON_NAME = PATH_TO_ICONS .. "/actions/24/player_pause.png"
local PLAY_ICON_NAME = PATH_TO_ICONS .. "/actions/24/player_play.png"
local STOP_ICON_NAME = PATH_TO_ICONS .. "/actions/24/player_stop.png"

local icon = wibox.widget({
	id = "icon",
	widget = wibox.widget.imagebox,
	image = PLAY_ICON_NAME,
})
local mirrored_icon = wibox.container.mirror(icon, { horizontal = true })

local mpdarc = wibox.widget({
	mirrored_icon,
	max_value = 1,
	value = 0.75,
	thickness = 2,
	start_angle = 4.71238898, -- 2pi*3/4
	forced_height = 32,
	forced_width = 32,
	rounded_edge = true,
	paddings = 0,
	widget = wibox.container.arcchart,
})

local mpdarc_icon_widget = wibox.container.mirror(mpdarc, { horizontal = true })
local mpdarc_current_song_widget = wibox.widget({
	id = "current_song",
	widget = wibox.widget.textbox,
	font = "Sarasa Gothic SC 10",
})

local update_graphic = function(widget, stdout, _, _, _)
	local current_song = string.gmatch(stdout, "[^\r\n]+")()
	stdout = string.gsub(stdout, "\n", "")
	local mpdpercent = string.match(stdout, "(%d%d)%%")
	local mpdstatus = string.match(stdout, "%[(%a+)%]")
	if mpdstatus == "playing" then
		icon.image = PLAY_ICON_NAME
		widget.colors = { beautiful.widget_main_color }
		widget.value = tonumber((100 - mpdpercent) / 100)
		mpdarc_current_song_widget.markup = "<span foreground='" .. beautiful.green .. "'>" .. current_song .. "</span>"
	elseif mpdstatus == "paused" then
		icon.image = PAUSE_ICON_NAME
		widget.colors = { beautiful.widget_main_color }
		widget.value = tonumber(mpdpercent / 100)
		mpdarc_current_song_widget.markup = "<span foreground='" .. beautiful.red .. "'>" .. current_song .. "</span>"
	else
		icon.image = STOP_ICON_NAME
		if string.len(stdout) == 0 then -- MPD is not running
			mpdarc_current_song_widget.markup = "MPD is not running"
		else
			widget.colors = { beautiful.widget_red }
			mpdarc_current_song_widget.markup = ""
		end
	end
end

mpdarc:connect_signal("button::press", function(_, _, _, button)
	if button == 1 then
		awful.spawn(TOGGLE_MPD_CMD, false) -- left click
	elseif button == 2 then
		awful.spawn(STOP_MPD_CMD, false)
	elseif button == 3 then
		awful.spawn(PAUSE_MPD_CMD, false)
	elseif button == 4 then
		awful.spawn(NEXT_MPD_CMD, false) -- scroll up
	elseif button == 5 then
		awful.spawn(PREV_MPD_CMD, false) -- scroll down
	end

	spawn.easy_async(GET_MPD_CMD, function(stdout, stderr, exitreason, exitcode)
		update_graphic(mpdarc, stdout, stderr, exitreason, exitcode)
	end)
end)

local notification
local function show_MPD_status()
	spawn.easy_async(GET_MPD_CMD, function(stdout, _, _, _)
		notification = naughty.notify({
			text = stdout,
			title = "MPD",
			timeout = 5,
			hover_timeout = 0.5,
			width = 600,
		})
	end)
end

mpdarc:connect_signal("mouse::enter", function()
	show_MPD_status()
end)
mpdarc:connect_signal("mouse::leave", function()
	naughty.destroy(notification)
end)

watch(GET_MPD_CMD, 1, update_graphic, mpdarc)

local spacer = wibox.widget.textbox(" ")

local mpdarc_widget = wibox.widget({
	mpdarc_icon_widget,
	spacer,
	mpdarc_current_song_widget,
	layout = wibox.layout.align.horizontal,
})
return mpdarc_widget
